From f62505d25cce0576d0fa38c7d38b8582fcc0c938 Mon Sep 17 00:00:00 2001
From: jvoisin
Date: Thu, 22 Sep 2011 18:08:10 +0200
Subject: Support of png + cleanup

---
 mat/exiftool.py | 66 ++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 49 insertions(+), 17 deletions(-)

diff --git a/mat/exiftool.py b/mat/exiftool.py
index 7cd279a..f1bc350 100644
--- a/mat/exiftool.py
+++ b/mat/exiftool.py
@@ -3,20 +3,28 @@
 '''
 
 import subprocess
-import images
+import parser
 
 
-class JpegStripper(images.JpegStripper):
+class ExiftoolStripper(parser.GenericParser):
     '''
-        Care about jpeg files with help
-        of exiftool
+        A generic stripper class using exiftool as backend
     '''
-    ALLOWED = ['ExifTool Version Number', 'File Name', 'Directory',
-        'File Size', 'File Modification Date/Time', 'File Permissions',
-        'File Type', 'MIME Type', 'JFIF Version', 'Resolution Unit',
-        'X Resolution', 'Y Resolution', 'Image Width', 'Image Height',
-        'Encoding Process', 'Bits Per Sample', 'Color Components',
-        'Y Cb Cr Sub Sampling', 'Image Size']
+
+    def __init__(self, filename, parser, mime, backup, add2archive):
+        super(ExiftoolStripper, self).__init__(filename, parser, mime,
+        backup, add2archive)
+        self.allowed = ['ExifTool Version Number', 'File Name', 'Directory',
+                'File Size', 'File Modification Date/Time', 'File Permissions',
+                'File Type', 'MIME Type', 'Image Width', 'Image Height',
+                'Image Size']
+        self._set_allowed()
+
+    def _set_allowed(self):
+        '''
+            Set the allowed/harmless list of metadata
+        '''
+        raise NotImplementedError
 
     def remove_all(self):
         '''
@@ -24,33 +32,57 @@ class JpegStripper(images.JpegStripper):
         '''
         if self.backup:
             process = subprocess.Popen(['exiftool', '-all=',
-                '-o %s' % self.output, self.filename])
-            #, stdout=open('/dev/null'))
+                '-o %s' % self.output, self.filename],
+                stdout=open('/dev/null'))
             process.wait()
         else:
             process = subprocess.Popen(['exiftool', '-overwrite_original',
-                    '-all=', self.filename])  # , stdout=open('/dev/null'))
+                '-all=', self.filename], stdout=open('/dev/null'))
             process.wait()
 
     def is_clean(self):
         '''
-            Check if the file is clean
+            Check if the file is clean with help of exiftool
         '''
         out = subprocess.Popen(['exiftool', self.filename],
                 stdout=subprocess.PIPE).communicate()[0]
         out = out.split('\n')
         for i in out[:-1]:
-            if i.split(':')[0].strip() not in self.ALLOWED:
+            if i.split(':')[0].strip() not in self.allowed:
                 return False
         return True
 
-    def get_meta(self):  # FIXME: UGLY
+    def get_meta(self):
+        '''
+            Return every harmful meta with help of exiftool
+        '''
         out = subprocess.Popen(['exiftool', self.filename],
                 stdout=subprocess.PIPE).communicate()[0]
         out = out.split('\n')
         meta = {}
         for i in out[:-1]:
             key = i.split(':')[0].strip()
-            if key not in self.ALLOWED:
+            if key not in self.allowed:
                 meta[key] = i.split(':')[1].strip()
         return meta
+
+
+class JpegStripper(ExiftoolStripper):
+    '''
+        Care about jpeg files with help
+        of exiftool
+    '''
+    def _set_allowed(self):
+        self.allowed.extend(['JFIF Version', 'Resolution Unit',
+        'X Resolution', 'Y Resolution', 'Encoding Process', 'Bits Per Sample',
+        'Color Components', 'Y Cb Cr Sub Sampling'])
+
+class PngStripper(ExiftoolStripper):
+    '''
+        Care about png files with help
+        of exiftool
+    '''
+    def _set_allowed(self):
+        self.allowed.extend(['Bit Depth', 'Color Type', 'Compression',
+            'Filter', 'Interlace', 'Pixels Per Unit X', 'Pixels Per Unit Y',
+            'Pixel Units'])
-- 
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